vCenter Server Appliance for vCenter Server 6.0 uses PostgreSQL for the embedded database. For external databases, vCenter Server Appliance supports only Oracle databases, in the same versions shown in the VMware Product Interoperability Matrix for the version of vCenter Server that you are upgrading to.

You can continue to use existing VMFS3 datastores, but you cannot create new VMFS3 datastores. If you have VMFS3 datastores, upgrade them to VMFS5. For information on upgrading your VMFS volumes, see thevSphere Storage document.